Beginners guide for SSL certificate for WebUI

[hpspar05]

I keep trying to get Let's Encrypt and Proxmox to play with each other but I'm doing something wrong and I don't what it is.
Here's the error I keep getting,

urn:ietf: params:acme:error:unauthorized :: The client lacks sufficient authorization

 

[Dominic]

Hi,

have you tried adding a certificate via CLI or using the GUI? If CLI, what command have you used exactly?